With the help of several contributors (Docholiday, BaldlLoonie and others) I have pretty much decided on the HVAC configuration for my new home.

But I must say the most intriguing solution that I have researched is a geo thermal system (probably because it's so unique and seems to deliver consistent savings).

But I won't use this system, primarily just too expensive and I'm probably not courageous enough.

What do the professional members think about geo thermal systems? Do you think they will become more popular in the future as energy costs increase? Do any of the profesional members have experience in this area, and can they offer any insights into this technology?